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LakeQuality
D

Dakota County Lake Quality

Minnesota, 36 lakes, average grade D (Poor)

There are 36 graded lakes in Dakota County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. On average, Dakota County lakes grade D, with phosphorus loading and reduced clarity showing up across most of the dataset.

The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Holland Lake (A); the most-stressed is Thompson Lake (F).

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DNR Reports (44)

Minnesota DNR LakeFinder resources for lakes in Dakota County. Showing 12 most recent — browse all reports →

All Lakes in Dakota County

RankLakeGradeClarityMax DepthPhosphorus
1Holland LakeA27.9 ft55 ft20 µg/L
2O'Brien LakeB19.7 ft-21 µg/L
3Schultz LakeB8.5 ft-20 µg/L
4Lac Lavon LakeB12.8 ft32 ft-
5Sunfish LakeB11.5 ft-20 µg/L
6Unnamed LakeB6.9 ft-25 µg/L
7Lemay LakeB6.9 ft15.5 ft27 µg/L
8Blackhawk LakeB6.9 ft12 ft25 µg/L
9Carlson LakeB8 ft19 ft26 µg/L
10Mcdonough LakeC9.8 ft13 ft25 µg/L
11Jensen LakeC5 ft-23.5 µg/L
12Marion LakeC7 ft21 ft-
13Fish LakeC6.9 ft33.5 ft36.5 µg/L
14Crystal LakeC7 ft37 ft-
15Thomas LakeC5.6 ft8 ft25 µg/L
16Pitts LakeC4.9 ft-43 µg/L
17East Thomas LakeC5.2 ft19 ft30 µg/L
18Bald LakeC4.9 ft-44 µg/L
19Keller LakeC4.3 ft7 ft31.5 µg/L
20Orchard LakeC4.8 ft33 ft30 µg/L
21Pickerel LakeD3.6 ft11 ft-
22Bur Oaks PondD4.6 ft9 ft64 µg/L
23Rogers LakeD4 ft8 ft-
24Gerhardt LakeD2.5 ft-43 µg/L
25Hilltop Pd LakeD3.6 ft12 ft97 µg/L
26Thompson LakeF2.8 ft8 ft-
27Spring LakeF2.1 ft17 ft-
28Chub LakeF0.5 ft10 ft-
29Augusta LakeF--178 µg/L
30O'Leary LakeF2.6 ft33.5 ft153 µg/L
31Unn PondF2 ft-135 µg/L
32Mccarthy LakeF1 ft19 ft195 µg/L
33Schmitt LakeF3.3 ft--
34Quigley LakeF2 ft-141 µg/L
35Byllesby LakeF3 ft50 ft220 µg/L
36Gun Club LakeF2.8 ft9.5 ft-

Source: EPA National Aquatic Resource Surveys, 2026.